CLAS physics database search results Measurement E46M158 N/A 0 cos(theta_HS^pi+) dsigma/dcos(theta_HS^pi+) Data errors dimensionless mcb mcb -0.875 0.186623 0.090448 -0.625 0.170478 0.049985 -0.375 0.117219 0.031672 -0.125 0.10471 0.046532 0.125 0.139186 0.063747 0.375 0.086039 0.368074 0.625 0.101478 0.035977